CN112609127A - Steel for high-strength and high-toughness drill string adapter and production process thereof - Google Patents

Steel for high-strength and high-toughness drill string adapter and production process thereof Download PDF

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CN112609127A
CN112609127A CN202011359002.1A CN202011359002A CN112609127A CN 112609127 A CN112609127 A CN 112609127A CN 202011359002 A CN202011359002 A CN 202011359002A CN 112609127 A CN112609127 A CN 112609127A
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steel
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drill string
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完颜卫国
龚志翔
高振波
李小虎
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a high-strength and high-toughness steel for a drill string adapter and a production process thereof, wherein the steel comprises 0.43-0.48% of C, 0.25-0.35% of Si, 1.05-1.20% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 1.05-1.20% of Cr, 0.25-0.35% of Mo, 0.015-0.035% of Als, 0.0012-0.0080% of Re, less than or equal to 0.0020% of O, less than or equal to 0.00020% of H and the balance of iron and impurity elements. According to the invention, rare earth elements are added in the component design of the steel grade, and the longitudinal upsetting of the rolled stock is increased by controlling the production process, so that the anisotropy of the joint is obviously reduced, the low-temperature toughness of the joint is improved, the quality of the joint is improved, the content of steel microalloy elements for the drill string adapter is reduced as far as possible, the resource is saved, and the cost is reduced.

Description

Steel for high-strength and high-toughness drill string adapter and production process thereof
Technical Field
The invention relates to the technical field of alloy structural steel in mining equipment, in particular to high-strength and high-toughness steel for a drill string adapter and a production process thereof.
Background
The petroleum drill string adapter is an indispensable important component in petroleum production drill string assembly and is used for connecting drill rods. The drill stem adapter is a key component for connecting the oil drill pipe body as a male bolt and a female bolt. The drill rod is used for drilling under the underground and extremely complex geological conditions of hundreds and thousands of meters, bears various acting forces such as pulling, pressing, twisting, punching, shearing and the like, and even bears the instant sudden change load. As the connecting piece between the pipe body and the pipe body, the working condition and the more complex stress which are worse than the pipe body are borne in the well drilling process, and the quality of the connecting piece is directly related to the success or failure of oil drilling. It is a common place for drilling tool failure accidents. Although the probability of drilling tool failure accidents is very low, if the failure accidents occur in the deep part, the salvaging cost and the salvaging difficulty are obviously higher than those of the deep drilling tools, so the loss is often huge, and sometimes the direct loss of one time of deep well accidents reaches ten million yuan.
Oil and gas drilling is an underground concealed project. With the rapid development of new drilling technologies in recent years, the working environment of a drill string adapter serving as a drill string connecting piece is worse, and a large number of problems of heterogeneity, uncertainty, non-structure, non-numeralization and the like exist.
In the industrial standard drill string adapter (SY/T5200-2012), the drill string adapter is required to be made of alloy steel, mechanically processed and formed by hot-rolled thick-wall pipes, round steel or forged blanks, and subjected to quenching and tempering. Yield strength R is required for phi 178-P0.2Not less than 689MPa, antiTensile strength Rm930MPa or more, the elongation A is or more than 13%, the minimum average value of normal-temperature longitudinal impact absorption energy AKV of the I-grade joint is or more than 70J (the single value is or more than 61J), and the minimum average value of normal-temperature transverse impact absorption energy AKV is or more than 60J (the single value is or more than 50J). Current petroleum drill string adapters are typically manufactured from American Standard 4137H Steel, which has the chemical composition (in weight percent) of 4137H steel in the American society for testing and materials Standard ASTM _ A29/A29M: c: 0.35-0.40%, Si: 0.15-0.35%, Mn: 0.70-0.90%, P is less than or equal to 0.035%, S is less than or equal to 0.040%, Cr: 0.80-1.10%, Mo: 0.15-0.25%, and the balance of iron and impurity elements. At present, when an oil drilling tool manufacturing factory produces a conversion joint, in order to ensure the quality requirements of products such as hardenability, low-temperature performance and the like of steel, the content of Mo is increased to 0.25-0.40%, the content of Mn is increased to 1.00%, the content of Cr is increased to 1.20%, and 0.1-0.15% of Ni is added. When in production, hot rolled round steel is directly used for processing and forming or round steel is used for forging and forming, and the main problem is that the performance of the joint, especially the transverse impact performance, can not reach the performance requirement of the I-grade joint.
With the development of the oil exploitation industry, higher requirements are put on the strength, plasticity, anisotropy, low-temperature toughness and the like of the drill string adapter so as to ensure the safety and reliability of the use of the drill string adapter. Particularly, the working conditions of the opposite drill rod adapter and the top drive adapter are worse, and the quality requirement is higher. The quality requirements imposed by the industry on high quality crossover joints are: yield strength RP0.2Not less than 850MPa, tensile strength Rm980MPa or more, the elongation A of the composite material is 15% or more, the normal-temperature longitudinal impact absorption energy AKV of the composite material is 100J or more, the normal-temperature transverse impact absorption energy AKV of the composite material is 70J or more, the-20 ℃ longitudinal impact absorption energy AKV of the composite material is 80J or more, and the-20 ℃ transverse impact absorption energy AKV of the composite material is 65J or more. The existing steel for the drill string adapter and the production process thereof are difficult to meet the quality requirements, and especially the transverse impact energy absorption at the temperature of minus 20 ℃ is difficult to even stably reach more than or equal to 50J.
The invention discloses a round steel for a high-strength and high-toughness hydrogen sulfide stress corrosion resistant drilling tool and a manufacturing method thereof (CN104532149B), and is characterized in that: the round steel comprises the following chemical components in percentage by mass: 0.20E ^ e0.30％，Si：0.15～0.40％，Mn：0.20～0.70％，P：≤0.010％，S：≤0.005％，Cr：0.70～1.20％，Mo：0.72～0.95％，Ni：≤0.25％，Cu：0.05～0.10％，Alt: 0.05-0.10%, V: less than or equal to 0.1 percent, Nb: less than or equal to 0.06 percent, Ti: less than or equal to 0.010 percent, N: less than or equal to 0.009%, B: 0.001 to 0.003% of Fe and the balance of inevitable impurity elements; the diameter of the round steel is 50-350 mm, the round steel with the specification of 200mm or below is sampled and inspected within half radius of the surface, the round steel with the specification of 200mm or above is sampled and inspected within 35mm of the surface, the yield strength of the round steel is not less than 758MPa, the tensile strength of the round steel is not less than 862MPa, the elongation of the round steel is not less than 15%, the reduction of area is not less than 35%, the Charpy impact power at room temperature is not less than 90J, and the average hardness of the whole section of the round steel is not more than 30 HRC. The technical scheme of the patent has the advantages of high Mo content, high cost and relatively low strength, contains V, Nb, B and other elements, and does not research and detect transverse impact absorption energy at the temperature of minus 20 ℃. There is no corresponding guaranteed value.
The invention discloses steel for an ultra-deep well drill rod joint and a manufacturing method thereof (CN 109972038A), and the steel comprises the following components in percentage by weight: c: 0.24% -0.32%, Si: 0.20% -0.40%, Mn: 0.80-1.20%, S is less than or equal to 0.010%, P is less than or equal to 0.020%, Cr: 0.80% -1.20%, V: 0.06-0.15%, Ni 0.10-0.20%, Cu not more than 0.20%, Mo: 0.40 to 0.80 percent of the total weight of the alloy, less than or equal to 20 multiplied by 10 < -6 > of O, less than or equal to 2 multiplied by 10 < -6 > of H, less than or equal to 70 multiplied by 10 < -6 > of N, and the balance of Fe. The technical scheme of the patent application contains V, Ni, the cost is high, the research and the detection on the transverse impact absorption energy at the temperature of minus 20 ℃ are not carried out, and the guarantee value of the transverse impact absorption energy at the temperature of minus 20 ℃ is not available.
Disclosure of Invention
The invention aims to provide a high-strength and high-toughness steel for a drill stem adapter and a production process thereof, wherein rare earth elements are added through the component design of the steel grade, the longitudinal upsetting of a rolled material is controlled and increased by the production process, and the like, so that the anisotropy of the adapter is obviously reduced, the low-temperature toughness of the adapter is improved, the quality requirement of the high-quality adapter is met, and the yield strength R of the adapter is highP0.2Not less than 850MPa, tensile strength RmNot less than 980MPa, and the elongation A not less than 15 percentNormal temperature longitudinal impact absorption energy AKV is more than or equal to 100J, normal temperature transverse impact absorption energy AKV is more than or equal to 70J, normal temperature longitudinal impact absorption energy AKV is more than or equal to 80J at minus 20 ℃, and transverse impact absorption energy AKV is more than or equal to 65J at minus 20 ℃; and the content of the microalloy elements of the steel for the drill string adapter is reduced as much as possible, so that the resources are saved, the cost is reduced, and the defects of the prior art are overcome.
In order to achieve the purpose, the invention provides the following technical scheme:
the steel for the high-strength and high-toughness drill string adapter comprises the following chemical components: C. si, Mn, P, S, Cr, Mo, O, H, Als, Re; the weight percentage of each chemical component is as follows: 0.43 to 0.48 percent of C, 0.25 to 0.35 percent of Si, 1.05 to 1.20 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, 1.05 to 1.20 percent of Cr, 0.25 to 0.35 percent of Mo, 0.015 to 0.035 percent of Als, 0.0012 to 0.0080 percent of Re, less than or equal to 0.0020 percent of total oxygen O in steel, less than or equal to 0.00020 percent of H, and the balance of ferrum and impurity elements.
Furthermore, the weight percentages of the chemical components are as follows: 0.44 to 0.46 percent of C, 0.27 to 0.29 percent of Si, 1.07 to 1.14 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 1.10 to 1.18 percent of Cr, 0.28 to 0.32 percent of Mo, 0.020 to 0.030 percent of Als, 0.0018 to 0.0048 percent of Re, less than or equal to 0.0020 percent of total oxygen O in steel, less than or equal to 0.00020 percent of H, and the balance of ferrum and impurity elements.
Furthermore, the weight percentages of the chemical components are as follows: 0.44 to 0.46 percent of C, 0.27 to 0.29 percent of Si, 1.07 to 1.14 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 1.10 to 1.18 percent of Cr, 0.28 to 0.32 percent of Mo, 0.020 to 0.030 percent of Als, 0.0022 to 0.0040 percent of Re, less than or equal to 0.0020 percent of total oxygen O in steel, less than or equal to 0.00020 percent of H, and the balance of ferrum and impurity elements.
The invention provides another technical scheme: a production process of steel for a high-strength and high-toughness drill string adapter comprises the following main steps of smelting, refining, protective pouring, continuous casting, rolling, forging, rough machining, heat treatment, fine machining, thread surface treatment, inspection and warehousing:
s1: in the smelting and refining process, high-purity rare earth alloy with the weight percentage of more than or equal to 95 percent of rare earth is added according to 0.35-2.5 kilograms per ton of molten steel;
s2: when the rolled steel is forged, the rolled steel is forged and deformed in the longitudinal direction and the transverse direction relative to the rolled steel, and the longitudinal forging compression ratio is more than or equal to 1.8;
s3: the heat treatment process is quenching and tempering heat treatment, wherein the heat treatment process comprises 840-880 ℃ heat preservation and then quenching, and 580-630 ℃ heat preservation and tempering.
Furthermore, the addition amount of the rare earth in S1 is 0.7-1.2 kg/ton of molten steel, and the high-purity rare earth alloy is high-purity lanthanum-cerium rare earth alloy; the adding method is that after the other alloys are added in the refining process, high-purity lanthanum cerium rare earth alloy blocks are added or high-purity lanthanum cerium rare earth alloy wires are fed.
Furthermore, in S2, the finish forging temperature is controlled to be more than or equal to 800 ℃, the workpiece is placed into a heat treatment furnace at 580-710 ℃ after finish forging, the temperature is kept for 2-5 hours after the furnace temperature reaches, and the workpiece is discharged from the furnace and cooled in air.
Compared with the prior art, the invention has the beneficial effects that:
according to the high-toughness steel for the drill string adapter and the production process thereof, rare earth elements are added through the component design of the steel grade, the longitudinal upsetting of a rolled material is controlled and increased by the production process, the anisotropy of the adapter is obviously reduced, the low-temperature toughness of the adapter is improved, the quality requirement of the high-quality adapter is met, and the yield strength R of the adapter is highP0.2Not less than 850MPa, tensile strength Rm980MPa or more, the elongation A is 15% or more, the normal temperature longitudinal impact absorption energy AKV is 100J or more, the normal temperature transverse impact absorption energy AKV is 70J or more, the-20 ℃ longitudinal impact absorption energy AKV is 80J or more, and the-20 ℃ transverse impact absorption energy AKV is 65J or more; and the content of microalloy elements in the steel for the drill string adapter is reduced as much as possible, so that the resources are saved, the cost is reduced, the product quality is improved, the customer requirements are met, and the product sales volume and the product added value are improved to increase the economic benefit.
Detailed Description
The following examples will explain the present invention in detail, however, the present invention is not limited thereto. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides high-strength and high-toughness steel for a drill string adapter, which comprises the following chemical components: C. si, Mn, P, S, Cr, Mo, O, H, Als, Re; the weight percentage of each chemical component is as follows: 0.43 to 0.48 percent of C, 0.25 to 0.35 percent of Si, 1.05 to 1.20 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, 1.05 to 1.20 percent of Cr, 0.25 to 0.35 percent of Mo, 0.015 to 0.035 percent of Als, 0.0012 to 0.0080 percent of Re, less than or equal to 0.0020 percent of total oxygen O in steel, less than or equal to 0.00020 percent of H, and the balance of ferrum and impurity elements.
The weight percentages of the chemical components provided by the invention are summarized in a plurality of experiments and practices, and are specifically based on the following:
carbon is an important element for improving hardenability and hardenability in steel, the appropriate carbon content range is 0.43-0.48%, the carbon content is higher than that of the steel for the drill string adapter commonly used at present, the full-section hardenability of the adapter is ensured, the impact toughness of the steel is improved, the strength of the steel is also improved, the consumption of other precious elements for improving the hardenability can be saved, the strength and the hardness can be reduced when the carbon is too low, the plasticity and the toughness can be reduced when the carbon is too high, and the quenching cracking tendency of a workpiece is increased.
Silicon exists in ferrite or austenite in the form of solid solution in steel, can improve the strength of steel, and is a deoxidizing element for steel making, but the content is not too high so as to avoid reducing the toughness of steel, so the invention is controlled to be 0.25-0.35%.
Manganese is also an important element for improving the hardenability, the suitable manganese content range is 1.05-1.20%, and the manganese content is higher than that of the steel for the conventional drill string adapter, so that the full-section hardenability of the adapter is ensured, and the consumption of other precious elements for improving the hardenability is saved.
Chromium and molybdenum are also important elements for improving hardenability, and the chromium content is suitably in the range of 1.05-1.20%, and the molybdenum content is suitably in the range of 0.25-0.35%.
Aluminum is a deoxidizer in steel, can refine the structure of the steel, can form excessive oxide impurities when the aluminum content is too high, and is suitable for the acid-soluble aluminum content of 0.015-0.035%.
The minimum requirements of the invention are that P is less than or equal to 0.010 percent and S is less than or equal to 0.008 percent, and strip-shaped MnS inclusions are important reasons for causing the anisotropy of the steel; therefore, particular attention should be paid to minimizing sulfur content; oxygen and hydrogen are harmful gas elements in steel and are strictly controlled.
The rare earth content in the steel is 0.0012-0.0080%, which is a key measure for improving the low-temperature transverse impact absorption performance of the steel, and the addition of a proper amount of rare earth can refine grains, purify the steel, reduce the total amount of inclusions, make the inclusions become fine and disperse, obviously improve anisotropy and improve the low-temperature transverse impact performance.
Based on the chemical component proportions, the invention provides another technical scheme: a production process of steel for a high-strength and high-toughness drill string adapter comprises the following main steps of smelting → refining (including vacuum degassing) → protective pouring → continuous casting → rolling → forging → rough machining → heat treatment → fine machining → thread surface treatment → inspection and warehousing:
the first step is as follows: in the smelting and refining process, adding high-purity rare earth alloy with the weight percentage of rare earth being more than or equal to 95 percent according to 0.35-2.5 kg/ton of molten steel, wherein the most suitable rare earth is 0.7-1.2 kg/ton of molten steel, the most suitable high-purity rare earth alloy is high-purity lanthanum cerium rare earth alloy, and the best adding method is to add high-purity lanthanum cerium rare earth alloy blocks or feed high-purity lanthanum cerium rare earth alloy wires after other alloys are added in the refining process;
the second step is that: when the rolled steel is forged, the rolled steel is required to be forged and deformed relative to the longitudinal direction and the transverse direction of the rolled steel, the longitudinal forging compression ratio (upsetting compression ratio) is more than or equal to 1.8, during actual production, the final forging temperature is controlled to be more than or equal to 800 ℃, a workpiece is placed into a 580-710 ℃ heat treatment furnace after the final forging, the temperature is kept for 2-5 hours after the furnace temperature reaches the temperature, and the workpiece is cooled in the air taken out of the furnace, so that a near-equilibrium state tissue can be obtained through treatment, and the preparation on the tissue is made for the subsequent quenching and tempering heat treatment;
the third step: the heat treatment process is quenching and tempering heat treatment, wherein the heat treatment process comprises 840-880 ℃ heat preservation and then quenching, and 580-630 ℃ heat preservation and tempering.
To further illustrate the differences between the technical solution of the present invention and the prior art, the following examples and comparative examples are also provided for analysis:
the chemical compositions of the examples and comparative examples are shown in table 1 (melting analysis, balance Fe and impurity elements):
TABLE 1
Figure BDA0002803458470000081
The A-type drill collar joint with the outer diameter of 203.2mm, which is made of the steel in the examples 1-5 and the comparative examples 1-2, mainly comprises the following production process flows: smelting → refining (vacuum degassing) → protective casting → continuous casting → rolling → forging → rough machining → heat treatment → fine machining → thread surface treatment → inspection and warehousing, the main process parameters are shown in table 2:
TABLE 2
Figure BDA0002803458470000091
The mechanical properties (examined according to SY/T52OO-2012 standard) of the drill collar joints made of the steels of the above examples 1-5 and comparative examples 1-2 are shown in Table 3:
TABLE 3
Figure BDA0002803458470000092
Figure BDA0002803458470000101
As can be seen from the above table, comparing examples 1-5 with comparative examples 1 and 2 respectively, the petroleum drill string crossover joints made by examples 1-5 have higher strength and better impact performance, especially better transverse impact absorption energy at-20 ℃, and Ni and V are not added in examples 1-5, and Mo is lower than that in comparative example 2, so that resources are saved and production cost is reduced.
In summary, the following steps: the invention provides a high-strength and high-toughness steel for a drill string adapter and a production process thereofThe control and increase of longitudinal upsetting of the rolled stock and the like obviously reduce the anisotropy of the joint, improve the low-temperature toughness of the joint and improve the quality of the joint so as to meet the quality requirement of a high-quality conversion joint, and the yield strength R of the conversion jointP0.2Not less than 850MPa, tensile strength Rm980MPa or more, the elongation A is 15% or more, the normal temperature longitudinal impact absorption energy AKV is 100J or more, the normal temperature transverse impact absorption energy AKV is 70J or more, the-20 ℃ longitudinal impact absorption energy AKV is 80J or more, and the-20 ℃ transverse impact absorption energy AKV is 65J or more; and the content of microalloy elements in the steel for the drill string adapter is reduced as much as possible, so that the resources are saved, the cost is reduced, the product quality is improved, the customer requirements are met, and the product sales volume and the product added value are improved to increase the economic benefit.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (6)

1. The steel for the high-strength and high-toughness drill string adapter is characterized by comprising the following chemical components: C. si, Mn, P, S, Cr, Mo, O, H, Als, Re; the weight percentage of each chemical component is as follows: 0.43 to 0.48 percent of C, 0.25 to 0.35 percent of Si, 1.05 to 1.20 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, 1.05 to 1.20 percent of Cr, 0.25 to 0.35 percent of Mo, 0.015 to 0.035 percent of Als, 0.0012 to 0.0080 percent of Re, less than or equal to 0.0020 percent of total oxygen O in steel, less than or equal to 0.00020 percent of H, and the balance of ferrum and impurity elements.
2. The steel for the high-strength and high-toughness drill string adapter joint as recited in claim 1, wherein the steel comprises the following chemical components in percentage by weight: 0.44 to 0.46 percent of C, 0.27 to 0.29 percent of Si, 1.07 to 1.14 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 1.10 to 1.18 percent of Cr, 0.28 to 0.32 percent of Mo, 0.020 to 0.030 percent of Als, 0.0018 to 0.0048 percent of Re, less than or equal to 0.0020 percent of total oxygen O in steel, less than or equal to 0.00020 percent of H, and the balance of ferrum and impurity elements.
3. The steel for the high-strength and high-toughness drill string adapter joint as recited in claim 2, wherein the steel comprises the following chemical components in percentage by weight: 0.44 to 0.46 percent of C, 0.27 to 0.29 percent of Si, 1.07 to 1.14 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 1.10 to 1.18 percent of Cr, 0.28 to 0.32 percent of Mo, 0.020 to 0.030 percent of Als, 0.0022 to 0.0040 percent of Re, less than or equal to 0.0020 percent of total oxygen O in steel, less than or equal to 0.00020 percent of H, and the balance of ferrum and impurity elements.
4. The production process of the steel for the high-strength and high-toughness drill string adapter according to claim 1, which comprises the following steps of smelting, refining, protective casting, continuous casting, rolling, forging, rough machining, heat treatment, fine machining, thread surface treatment, inspection and warehousing, and is characterized by mainly comprising the following steps of:
s1: in the smelting and refining process, high-purity rare earth alloy with the weight percentage of more than or equal to 95 percent of rare earth is added according to 0.35-2.5 kilograms per ton of molten steel;
s2: when the rolled steel is forged, the rolled steel is forged and deformed in the longitudinal direction and the transverse direction relative to the rolled steel, and the longitudinal forging compression ratio is more than or equal to 1.8;
s3: the heat treatment process is quenching and tempering heat treatment, wherein the heat treatment process comprises 840-880 ℃ heat preservation and then quenching, and 580-630 ℃ heat preservation and tempering.
5. The process for producing a steel for a high toughness drill string adapter according to claim 4, wherein the amount of rare earth added in S1 is 0.7-1.2 kg/ton molten steel, and the high purity rare earth alloy is a high purity lanthanum cerium rare earth alloy; the adding method is that after the other alloys are added in the refining process, high-purity lanthanum cerium rare earth alloy blocks are added or high-purity lanthanum cerium rare earth alloy wires are fed.
6. The production process of the steel for the high strength and toughness drill string adapter as recited in claim 4, wherein the finish forging temperature is controlled to be more than or equal to 800 ℃ in S2, the workpiece is placed into a heat treatment furnace at 580 ℃ -710 ℃ after finish forging, the temperature is kept for 2-5 hours after the furnace temperature reaches, and the workpiece is cooled in the air after being taken out of the furnace.
CN202011359002.1A 2020-11-27 2020-11-27 Steel for high-strength and high-toughness drill string adapter and production process thereof Pending CN112609127A (en)

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